Feet and Inch Diagonal Calculator | Square it Up

Use this feet and inch diagonal calculator to easily find the diagonal between two sides of any rectangle. This makes squaring up any lay out a snap.

How to Square up a Lay Out

  • Establish two parallel lines for the the width
  • Establish a starting point for the length on one of the lines
  • Mark the length down one of the lines from the starting point
  • Mark the diagonal on the other line from the same starting point
  • Mark the length down the line from the diagonal mark
  • Check the width, the length and diagonal measurements to ensure everything is right